angular 2 - Injected service in http error handler

Question

I have a method handleError() like in the documentation https://angular.io/docs/ts/latest/guide/server-communication.html#!#error-handling

private handleErro         


        

Answer 1

Since you're passing the function directly, you don't have the this context of your class in there. A really easy and best practice way would be to use a lambda or "fat arrow function":

this.http.get(url, ApiRequest.ACCEPT_JSON)
    .map(res => ApiHelper.extractData(res))
    .catch(err => this.handleError(err));

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A really good read on when to use lambdas: https://stackoverflow.com/a/23045200/1961059